Toshiba has introduced the first microSD memory cards in the industry to comply with the UHS-II interface standard, the ultra high speed serial bus interface defined in the SD Memory Card Standard Ver. 4.20.

The 64GB cards offer a maximum read speed of 260MB/s and a maximum write speed of 240MB/s. The 32GB cards have a maximum read speed of 145MB/s and maximum write speed of 130MB/s, which represents an 8x write speed improvement and 2.7x read speed improvement when compared to Toshiba's current 32GB microSD UHS-I cards.